Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Convertible Preferred Stock [Member]
Stockholders’ equity:
Convertible preferred stock, $0.001 par value; authorized: 5,000,000 shares; none issued and outstanding
Cash and cash equivalents	$ 11,627	$ 9,803
Marketable investments	54,708	71,343
Accounts receivable, net	8,919	11,137
Inventories	13,521	10,988
Deferred tax asset	27	26
Other current assets and prepaid expenses	1,625	1,591
Total current assets	90,427	104,888
Property and equipment, net	1,512	1,461
Deferred tax asset, net of current portion	283	269
Intangibles, net	332	595
Goodwill	1,339	1,339
Other long-term assets	351	361
Total assets	94,244	108,913
Accounts payable	3,597	3,083
Accrued liabilities	10,308	11,007
Deferred revenue	8,659	8,898
Total current liabilities	22,564	22,988
Deferred revenue, net of current portion	3,107	4,346
Income tax liability	180	145
Other long-term liabilities	699	926
Total liabilities	$ 26,550	28,405
Commitments and Contingencies (Note 10)
Common stock, $0.001 par value; authorized: 50,000,000 shares; issued and outstanding: 14,230,448 and 14,446,950 shares at June 30, 2015 and December 31, 2014, respectively	$ 14	14
Additional paid-in capital	98,428	105,721
Accumulated deficit	(30,765)	(25,232)
Accumulated other comprehensive income	17	5
Total stockholders’ equity	67,694	80,508
Total liabilities and stockholders’ equity	$ 94,244	$ 108,913